Mobile Device Vibration-Based Communication State Control

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Solution Overview

Problem

The existing passive entry system fails to recognize a mobile device when it is inside a vehicle, as the device stops detecting vibration and enters a communication disabled state, leading to potential battery exhaustion and increased risk of theft through relay attacks, and prevents the vehicle-mounted communication device from authenticating the mobile device.

Innovation Solution

A mobile device equipped with a vibration sensor that switches between communication enabled and disabled states based on detected vibration, remaining in an enabled state once radio communication is established, ensuring continuous communication with the vehicle-mounted communication device even after vibration is no longer detected.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If the mobile device enters communication disabled state when vibration is not detected, then battery consumption is reduced, but the device cannot be recognized inside the vehicle

Engineering Contradiction:

Improvebattery consumptionVSAvoiddevice recognition

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The system performs preliminary authentication and establishes communication before the device enters the vehicle. Once authenticated, the device maintains communication enabled state even after vibration stops, ensuring continuous recognition inside the vehicle while still conserving battery when outside the vehicle area.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses feedback from the vibration sensor to dynamically adjust communication state. When vibration is detected, communication is enabled; when vibration stops but authentication is established, communication remains enabled. This feedback mechanism ensures the device is recognized inside the vehicle while conserving battery when not in use.

Inventive Principle:

Principle #23Feedback

2Use of energy by moving object

If the mobile device stops communication when vibration is not detected, then power consumption is reduced, but security against relay attacks is compromised

Engineering Contradiction:

Improvepower consumptionVSAvoidrelay attack risk

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

Authentication is performed in advance when the device is still vibrating and outside the vehicle. This preliminary authentication establishes a secure connection before the device enters the vehicle, preventing relay attacks while allowing the device to enter low-power mode once authenticated.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Once authentication is established, the communication enabled state is maintained continuously even after vibration stops. This ensures uninterrupted secure communication inside the vehicle, preventing relay attacks while managing power consumption through selective maintenance of communication state.

Inventive Principle:

Principle #20Continuity of useful action

3Reliability

If the mobile device remains in communication enabled state continuously, then device recognition is ensured, but battery exhaustion occurs

Engineering Contradiction:

Improvedevice recognitionVSAvoidbattery consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The communication state is made dynamic rather than static. The system transitions between communication enabled and disabled states based on real-time conditions: vibration detection, authentication status, and vehicle proximity. This dynamic adjustment ensures device recognition when needed while conserving battery when not needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the communication state parameter based on operational conditions. When vibration is detected or authentication is established, communication is enabled; otherwise, it is disabled. This parameter change strategy ensures reliable device recognition while optimizing battery consumption through conditional communication activation.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Prevents battery exhaustion and theft by maintaining communication with the vehicle-mounted device, allowing the mobile device to be recognized within the vehicle interior, thus enabling secure authentication and preventing unauthorized unlocking.

Implementation Method 1

When vibration of the mobile device is not detected, the mobile device is brought into a communication disabled state

Methodology Applied

Scientific EffectVibration detection: Vibration

Data Source

PatentUS10701523B2Mobile device and method of controlling mobile device

Publication Date: 2020.06.30 DENSO CORP

AI summary

A mobile device includes a receiver receiving a radio wave from a wireless communication device, a transmitter transmitting an authentication signal when the radio wave that is received requests transmission of the authentication signal, a vibration detector detecting whether there is vibration, and an operation controller bringing the mobile device into a communication enabled state where the receiver and the transmitter are in operation when the vibration is detected, and bringing the mobile device into a communication disabled state where at least one of the receiver and the transmitter is stopped when the vibration is not detected. When the radio wave is received in the communication enabled state, the operation controller brings the mobile device into a communication enabled continuous state where the receiver and the transmitter are in operation even if the vibration is no longer detected.